Mold.



No. 829,377. PATENTED AUG. 21, 1906.

` G. H. BARTLBTT.

MOLD.

APPLIUATIOB FILED OULZ'I, 1906.

2 EERSTE-SHEET 1.

MM /W- jorfzqaz PATBNTED AUG. 21, 1906.

G. H. BARTLETT.

MOLD.

rPLIoA'rIou FILED 001221. moa.

2 SHEETS-SHEET 2.

/0/ wwn argan UNITED STATES PATENT OFFICE.

GEORGE H. BARTLETT, OE BOSTON, MASSACHUSETTS.

MOLD.

Specification of Letters Patent.

Patented Aug. 21, 1906.

Application filed ctober 27, 1905. Serial Noy 284,597.

To all whom t may concern:

Beit known that I, GEORGE H. BAETLETT, of Boston, in the county of Suffolk and State of Massachusetts, have invented certain new and useful Improvements in Molds, of which the following is a s eciiication.

My invention re ates to molds, and more particularly to those ada ted for use in formlng'concrete bricks or b ocks. Its principal Objects are to provide an effective device of this character which may be employed in carrying out either the dry or wet process.

It consists in various features and combinations hereinafter described and more particularly claimed.

the accompanying drawings, in which similar characters describe like parts throughout the several views, Figure 1 is a top plan view of one embodiment of my invention, it being shown as arranged to produce bricks by the dry process. Fig. 2 is an end elevation thereof. Fig. 3 is a top plan view, the device being arranged for use in connection with the wet process and Fig. f1 is an end elevation of another form of the invention.

10 designates a base which has extended across it a groove or recess l1 to receive a pallet or board 12, the ends of which are shown as projecting beyond the base at each end of the recess for convenience in handling. Upon th'e top of this pallet is a strip of facing 13, of some smooth or olished material, which :may be glass, perce ain, or some metal resistive of corrosion-nickel, for example-h but is preferably of hard rubber, this being capable of having readily imparted to it the re uisite finish, while it also offers but little adhesion to the cement and is not liable to corrosion. The thickness of the pallet and facing is such that the top of the latter lies substantially flush with the top of the base, furnishing a continuous surface.

At each side of the pallet-recess, extending outwardly at right angles therefrom, are guides formed by pairs of separated ways 14 14, which receive and preferably overha-n carrier-arms 15, mounted to slide toward and from one another. As shown, these car- Iier-arms support cooperating portions of a gan mold, each portion comprising an end wal 16, fixed to the associated carrier-arm at its center and having extending from it a series of side-wall or partition sections 17,

which are alined with the sections carried by the opposite end wall, the two sets of sections bein shown as substantially of equal length. T e wall-sections preferably over lap one another to furnish a tightjoint between the compartments of the mold, one set of the sections having at their ends depressions 18, which receive reduced portions or projections 19 from the ends of the opposite set. By the movement of the carrierarms in the guides these mold-sections may be traversed across the pallet, meeting at the center to complete the mold or when in the opposite position completely freeing it, so that it may be removed from its recess. In either position each carrier-arm may be locked in place by some suoli securing device as a set-screw 20, which is threaded through the arm and is capable of being turned into engagement with the base.

In forming blocks by the dry process the mold-sections are brought into cooperation over the pallet, as has just been described, and there secured by the set-screws. The compartments are now filled with the cementitious mixture, which is slightly moistened and is tamped down until it is properly compacted. The securing devices are then loosened and the mold-sections withdrawn to free the blocks. It should be noted that in doing this the stresses of the mold upon the blocks are balanced or are substantially equal in opposite directions, owin to the sections 17 meeting substantially lnldway of the space between the walls 16, so that there is but slight tendency to disturb any portion of the concrete-a dilliculty which is very liable to arise when an entire mold is drawn from the blocks within it. The pallet and its facing may now be lifted from the base by its prolllecting ends and set away in a suitable lace or the blocks to set, when another card may be applied and the operationrepeated.

In performin the wet process the molde sections are loc ed near their outmost position with the inner edges of the side walls .adjacent to the pallet-recess, as `particularly shown in Fig. 3 of the drawings. Here they furnish supports or abutments for auxiliary end walls 21, which are provided with a series of vertical grooves 22. In these grooves may be placed side walls 23, which complete the compartments. Into the compartments ICO the comparatively fluid cementitious mixture is poured, and this having been done the pallet and its facing and the walls 21 and 23 thereon are lifted Aand the auxiliary molds set away for the blocks to harden.

lf desired, instead of mounting the moldsections to slide upon the base the carrierarms and their guides may be omitted and. the sections hinged directly to the base, as is indicated at 24 in Fig. 4. When thus arranged, the withdrawal of the side walls from between the blocks will be in a curved direction, so that the oints of' separation between these walls and t 1e edges of the blocks will be a gradually-shifting one, this, in connection with the balancing of the stress, causing but little tendency to disturb the edges. The mold-sections may here be locked in their cooperating position by some such arrangement as pins 25, tting into sockets 26 in the base and contacting with the end walls. To free the sections and permit them to swing outwardly, one needs only to remove the pins. 1n this case, as well as in all the forms previously described, the walls may readily be removed and others substituted which will produce blocks of different dimensions.

It will be seen that my improved mold is extremely simple both in construction and operation, that in addition to the advantages hereinbefore pointed out it is not only inexpensive to manufacture, but that the parts that are withheld from use during the setting of the blocks represent but little capital invested, that the portions handled by the operators move easily, and that a block may be produced having a highly-finished face without entailing additional labor.

It may be noted that in addition to the materials hereinbefore mentioned as suitable for the facing of the pallet celluloid is also available for this urpose, this being in some respects preferab e to hard rubber.

Having thus described my invention, I claim- 1. A mold for cement blocks having opposite walls, and walls situated between said opposite walls and being formed in sections meeting substantially midway of the space between said opposite walls.

2. A mold for cement blocks having opposite walls, and walls situated between said opposite walls and being formed in alined sec-` tions meeting substantially midway of the space between said op erating ried by t 1e opposite walls.

3. A mold for cement blocks having opposite walls and overlappin Wall-sections carried by said opposite wals, the said sections meeting substantially midway of the space between said opposite walls.

4. A meld for cement blocks ha opposite walls, and wall-sections carried y said osite walls, the coop-` ortions of said sections being car-` opposite walls and meeting substantially midway ol the space between said. opposite walls, one of said sections being provided with depressions and another with a coperating projection.

5. A mold 'for cement blocks comprising a base, opposite walls mounted to move upon the base and having coi'iperating sections which are carried by said op )osite walls, said sections meeting substantial y midway of the space between said opposite walls.

6. A mold for cement blocks comprising a base provided with guides, carriers movable in the guides, walls ixed to the carriers, and intermediate walls extending from those first named and meeting substantially midway of the space between said opposite walls.

7. A mold for cement blocks comprising a base provided with guides, carriers movable in the guides, walls iixed to the carriers, and intermediate walls extending from those first named and being formed in alined sections meeting substantially midway of the space between said opposite walls.

8. A mold for cement blocks comprising a base provided with guides, carriers movable in the guides, walls ixed to the carriers, and intermediate walls extending from those iirst named and being formed in alined sections provided with cooperating projections and depressions meeting substantially midway of the space between said opposite walls.

9. The combination with a base, of a separable pallet carried by the base and projecting therefrom, a facing of smooth material supported upon the pallet, and mold-sections movably mounted upon the base at each side of the allet.

10. he combination with a base having a recess, of a separable pallet situated in the recess and projecting therefrom, a facing of smooth material sup orted upon the pallet and being substantia ly lush with the adj acent surface of the base, and a mold-section movably mounted upon the base at each side of the pallet.

11. A mold for cement blocks comprising a base provided with guides, opposite walls connected with said guides and mounted to move upon the base, a removable pallet on said base, auxiliary walls, and intermediate walls extending between the auxiliary walls.

12. A mold for cement blocks comprising1 a base provided Lwith guides, opposite wa ls connected with said guides and mounted to move upon the base, a removable pallet on said base, auxiliary walls rovided with grooves, and intermediate waltls supported in the grooves.

13. The combination with a base, ofpa separable pallet earried by the base, mold-seetions movably mounted u on the base at each side of the allet, auxi iary walls which may contact with said opposite walls at each IIC side of the pallet, and intermediate Walls extending across the pallet between the auxiliary Walls.

14. A mold for cement blocks having a Wall provided with a removable surface of non-vitreous material, such as eelluloid or hard rubber.

15. The combination With a base, of a separable pallet carried by the base, a facing of 1o non-vitreous material, such as Celluloid o1' hard rubber supported upon the pallet, and mold-sections movably mounted upon the base at each side of the latter.

In testimony whereof I have afxed my signature in presence of two Witnesses.

GEORGE H. BARTLETT.

Witnesses:

C. F. BROWN, W. W. DOWNS. 

